Found makemegenius.com very helpful for my children.It becomes easy for me to engage them. As my kids always love to be digital things, this site has come as very handy very relevant school subjects.

It seems they have just transformed school text books in videos & have incorporated examples from various places.Kids can watch it again & again and it helps them to revise their syllabus.Also it has lot of free school lessons in power point. Above all it is all free, and all topics for small kids are available.